On Thu, 2018-02-15 at 07:53 +0100, Niels Möller wrote: > Nikos Mavrogiannopoulos <[email protected]> writes: > > > +@acronym{CMAC} is a message authentication code based on CBC > > encryption > > +mode. It is suitable for systems where block ciphers are > > preferrable > > +and perform better than hash functions. @acronym{CMAC} is > > specified in > > +@cite{RFC4493}. The secret key is always 128 bits (16 octets). > > Should be "block size", not "secret key", right?
Right. Updated patch (and merged all), to include this fix, and the naming of variables (including changing out to dst). regards, Nikos
From 7737e2c9fdd5fd175014a8b97cfad044ed808317 Mon Sep 17 00:00:00 2001 From: Nikos Mavrogiannopoulos <[email protected]> Date: Wed, 10 Jan 2018 09:29:17 +0100 Subject: [PATCH] Added support for CMAC That adds support for CMAC as a generic framework for 128-bit block and key ciphers, as well as API for AES-128-CMAC, and AES-256-CMAC. Signed-off-by: Nikos Mavrogiannopoulos <[email protected]> --- Makefile.in | 2 + cmac-aes128.c | 60 +++++++++++++++++ cmac-aes256.c | 60 +++++++++++++++++ cmac.c | 158 ++++++++++++++++++++++++++++++++++++++++++++ cmac.h | 133 +++++++++++++++++++++++++++++++++++++ examples/nettle-benchmark.c | 24 ++++++- nettle.texinfo | 60 ++++++++++++++++- testsuite/.test-rules.make | 3 + testsuite/Makefile.in | 1 + testsuite/cmac-test.c | 146 ++++++++++++++++++++++++++++++++++++++++ 10 files changed, 645 insertions(+), 2 deletions(-) create mode 100644 cmac-aes128.c create mode 100644 cmac-aes256.c create mode 100644 cmac.c create mode 100644 cmac.h create mode 100644 testsuite/cmac-test.c diff --git a/Makefile.in b/Makefile.in index 4444e8bd..de12bb3f 100644 --- a/Makefile.in +++ b/Makefile.in @@ -100,6 +100,7 @@ nettle_SOURCES = aes-decrypt-internal.c aes-decrypt.c \ gcm-aes256.c gcm-aes256-meta.c \ gcm-camellia128.c gcm-camellia128-meta.c \ gcm-camellia256.c gcm-camellia256-meta.c \ + cmac.c cmac-aes128.c cmac-aes256.c \ gosthash94.c gosthash94-meta.c \ hmac.c hmac-md5.c hmac-ripemd160.c hmac-sha1.c \ hmac-sha224.c hmac-sha256.c hmac-sha384.c hmac-sha512.c \ @@ -192,6 +193,7 @@ HEADERS = aes.h arcfour.h arctwo.h asn1.h blowfish.h \ gcm.h gosthash94.h hmac.h \ knuth-lfib.h hkdf.h \ macros.h \ + cmac.h \ md2.h md4.h \ md5.h md5-compat.h \ memops.h memxor.h \ diff --git a/cmac-aes128.c b/cmac-aes128.c new file mode 100644 index 00000000..e53e114e --- /dev/null +++ b/cmac-aes128.c @@ -0,0 +1,60 @@ +/* cmac-aes128.c + + CMAC using AES128 as the underlying cipher. + + Copyright (C) 2017 Red Hat, Inc. + + This file is part of GNU Nettle. + + GNU Nettle is free software: you can redistribute it and/or + modify it under the terms of either: + + * the GNU Lesser General Public License as published by the Free + Software Foundation; either version 3 of the License, or (at your + option) any later version. + + or + + * the GNU General Public License as published by the Free + Software Foundation; either version 2 of the License, or (at your + option) any later version. + + or both in parallel, as here. + + GNU Nettle is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received copies of the GNU General Public License and + the GNU Lesser General Public License along with this program. If + not, see http://www.gnu.org/licenses/. +*/ + +#if HAVE_CONFIG_H +# include "config.h" +#endif + +#include <assert.h> + +#include "cmac.h" + +void +cmac_aes128_set_key(struct cmac_aes128_ctx *ctx, const uint8_t *key) +{ + CMAC128_SET_KEY(ctx, aes128_set_encrypt_key, aes128_encrypt, key); +} + +void +cmac_aes128_update (struct cmac_aes128_ctx *ctx, + size_t length, const uint8_t *data) +{ + CMAC128_UPDATE (ctx, aes128_encrypt, length, data); +} + +void +cmac_aes128_digest(struct cmac_aes128_ctx *ctx, + size_t length, uint8_t *digest) +{ + CMAC128_DIGEST(ctx, aes128_encrypt, length, digest); +} diff --git a/cmac-aes256.c b/cmac-aes256.c new file mode 100644 index 00000000..ec3b50db --- /dev/null +++ b/cmac-aes256.c @@ -0,0 +1,60 @@ +/* cmac-aes256.c + + CMAC using AES256 as the underlying cipher. + + Copyright (C) 2017 Red Hat, Inc. + + This file is part of GNU Nettle. + + GNU Nettle is free software: you can redistribute it and/or + modify it under the terms of either: + + * the GNU Lesser General Public License as published by the Free + Software Foundation; either version 3 of the License, or (at your + option) any later version. + + or + + * the GNU General Public License as published by the Free + Software Foundation; either version 2 of the License, or (at your + option) any later version. + + or both in parallel, as here. + + GNU Nettle is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received copies of the GNU General Public License and + the GNU Lesser General Public License along with this program. If + not, see http://www.gnu.org/licenses/. +*/ + +#if HAVE_CONFIG_H +# include "config.h" +#endif + +#include <assert.h> + +#include "cmac.h" + +void +cmac_aes256_set_key(struct cmac_aes256_ctx *ctx, const uint8_t *key) +{ + CMAC128_SET_KEY(ctx, aes256_set_encrypt_key, aes256_encrypt, key); +} + +void +cmac_aes256_update (struct cmac_aes256_ctx *ctx, + size_t length, const uint8_t *data) +{ + CMAC128_UPDATE (ctx, aes256_encrypt, length, data); +} + +void +cmac_aes256_digest(struct cmac_aes256_ctx *ctx, + size_t length, uint8_t *digest) +{ + CMAC128_DIGEST(ctx, aes256_encrypt, length, digest); +} diff --git a/cmac.c b/cmac.c new file mode 100644 index 00000000..95d45de4 --- /dev/null +++ b/cmac.c @@ -0,0 +1,158 @@ +/* + AES-CMAC-128 (rfc 4493) + Copyright (C) Stefan Metzmacher 2012 + Copyright (C) Jeremy Allison 2012 + Copyright (C) Michael Adam 2012 + Copyright (C) 2017, Red Hat Inc. + + This file is part of GNU Nettle. + + GNU Nettle is free software: you can redistribute it and/or + modify it under the terms of either: + + * the GNU Lesser General Public License as published by the Free + Software Foundation; either version 3 of the License, or (at your + option) any later version. + + or + + * the GNU General Public License as published by the Free + Software Foundation; either version 2 of the License, or (at your + option) any later version. + + or both in parallel, as here. + + GNU Nettle is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received copies of the GNU General Public License and + the GNU Lesser General Public License along with this program. If + not, see http://www.gnu.org/licenses/. +*/ + +#if HAVE_CONFIG_H +# include "config.h" +#endif + +#include <assert.h> +#include <stdlib.h> +#include <string.h> + +#include "cmac.h" + +#include "memxor.h" +#include "nettle-internal.h" +#include "macros.h" + +static const uint8_t const_zero[] = { + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 +}; + +/* shift one and XOR with 0x87. */ +static inline void block_mulx(union nettle_block16 *dst, + const union nettle_block16 *src) +{ + uint64_t b1 = READ_UINT64(src->b); + uint64_t b2 = READ_UINT64(src->b+8); + + b1 = (b1 << 1) | (b2 >> 63); + b2 <<= 1; + + if (src->b[0] & 0x80) + b2 ^= 0x87; + + WRITE_UINT64(dst->b, b1); + WRITE_UINT64(dst->b+8, b2); +} + +void cmac128_set_key(struct cmac128 *ctx, void *cipher, + nettle_cipher_func *encrypt) +{ + union nettle_block16 *L = &ctx->block; + memset(ctx, 0, sizeof(*ctx)); + + /* step 1 - generate subkeys k1 and k2 */ + encrypt(cipher, 16, L->b, const_zero); + + block_mulx(&ctx->K1, L); + block_mulx(&ctx->K2, &ctx->K1); +} + +#define MIN(x,y) ((x)<(y)?(x):(y)) + +void cmac128_update(struct cmac128 *ctx, void *cipher, + nettle_cipher_func *encrypt, + size_t msg_len, const uint8_t *msg) +{ + union nettle_block16 Y; + /* + * check if we expand the block + */ + if (ctx->index < 16) { + size_t len = MIN(16 - ctx->index, msg_len); + memcpy(&ctx->block.b[ctx->index], msg, len); + msg += len; + msg_len -= len; + ctx->index += len; + } + + if (msg_len == 0) { + /* if it is still the last block, we are done */ + return; + } + + /* + * now checksum everything but the last block + */ + memxor3(Y.b, ctx->X.b, ctx->block.b, 16); + encrypt(cipher, 16, ctx->X.b, Y.b); + + while (msg_len > 16) { + memxor3(Y.b, ctx->X.b, msg, 16); + encrypt(cipher, 16, ctx->X.b, Y.b); + msg += 16; + msg_len -= 16; + } + + /* + * copy the last block, it will be processed in + * cmac128_digest(). + */ + memcpy(ctx->block.b, msg, msg_len); + ctx->index = msg_len; +} + +void cmac128_digest(struct cmac128 *ctx, void *cipher, + nettle_cipher_func *encrypt, + unsigned length, + uint8_t *dst) +{ + union nettle_block16 Y; + + memset(ctx->block.b+ctx->index, 0, sizeof(ctx->block.b)-ctx->index); + + /* re-use ctx->block for memxor output */ + if (ctx->index < 16) { + ctx->block.b[ctx->index] = 0x80; + memxor(ctx->block.b, ctx->K2.b, 16); + } else { + memxor(ctx->block.b, ctx->K1.b, 16); + } + + memxor3(Y.b, ctx->block.b, ctx->X.b, 16); + + assert(length <= 16); + if (length == 16) { + encrypt(cipher, 16, dst, Y.b); + } else { + encrypt(cipher, 16, ctx->block.b, Y.b); + memcpy(dst, ctx->block.b, length); + } + + /* reset state for re-use */ + memset(&ctx->X, 0, sizeof(ctx->X)); + ctx->index = 0; +} diff --git a/cmac.h b/cmac.h new file mode 100644 index 00000000..4d7dffb2 --- /dev/null +++ b/cmac.h @@ -0,0 +1,133 @@ +/* cmac.h + + CMAC mode, as specified in RFC4493 + + Copyright (C) 2017 Red Hat, Inc. + + Contributed by Nikos Mavrogiannopoulos + + This file is part of GNU Nettle. + + GNU Nettle is free software: you can redistribute it and/or + modify it under the terms of either: + + * the GNU Lesser General Public License as published by the Free + Software Foundation; either version 3 of the License, or (at your + option) any later version. + + or + + * the GNU General Public License as published by the Free + Software Foundation; either version 2 of the License, or (at your + option) any later version. + + or both in parallel, as here. + + GNU Nettle is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received copies of the GNU General Public License and + the GNU Lesser General Public License along with this program. If + not, see http://www.gnu.org/licenses/. +*/ + +#ifndef NETTLE_CMAC_H_INCLUDED +#define NETTLE_CMAC_H_INCLUDED + +#include "aes.h" +#include "nettle-types.h" + +#ifdef __cplusplus +extern "C" { +#endif + +#define CMAC128_DIGEST_SIZE 16 + +#define cmac128_set_key nettle_cmac128_set_key +#define cmac128_update nettle_cmac128_update +#define cmac128_digest nettle_cmac128_digest +#define cmac_aes128_set_key nettle_cmac_aes128_set_key +#define cmac_aes128_update nettle_cmac_aes128_update +#define cmac_aes128_digest nettle_cmac_aes128_digest +#define cmac_aes256_set_key nettle_cmac_aes256_set_key +#define cmac_aes256_update nettle_cmac_aes256_update +#define cmac_aes256_digest nettle_cmac_aes256_digest + +struct cmac128 { + union nettle_block16 K1; + union nettle_block16 K2; + + union nettle_block16 X; + + union nettle_block16 block; + size_t index; +}; + +void cmac128_set_key(struct cmac128 *ctx, void *cipher, + nettle_cipher_func *encrypt); +void cmac128_update(struct cmac128 *ctx, void *cipher, + nettle_cipher_func *encrypt, + size_t msg_len, const uint8_t *msg); +void cmac128_digest(struct cmac128 *ctx, void *cipher, + nettle_cipher_func *encrypt, + unsigned length, + uint8_t *out); + + +#define CMAC128_CTX(type) \ + { struct cmac128 data; type cipher; } + +/* NOTE: Avoid using NULL, as we don't include anything defining it. */ +#define CMAC128_SET_KEY(ctx, set_key, encrypt, cmac_key) \ + do { \ + (set_key)(&(ctx)->cipher, (cmac_key)); \ + if (0) (encrypt)(&(ctx)->cipher, ~(size_t) 0, \ + (uint8_t *) 0, (const uint8_t *) 0); \ + cmac128_set_key(&(ctx)->data, &(ctx)->cipher, \ + (nettle_cipher_func *) (encrypt)); \ + } while (0) + +#define CMAC128_UPDATE(ctx, encrypt, length, data) \ + cmac128_update(&(ctx)->data, &(ctx)->cipher, \ + (nettle_cipher_func *)encrypt, (length), (data)) + +#define CMAC128_DIGEST(ctx, encrypt, length, digest) \ + (0 ? (encrypt)(&(ctx)->cipher, ~(size_t) 0, \ + (uint8_t *) 0, (const uint8_t *) 0) \ + : cmac128_digest(&(ctx)->data, &(ctx)->cipher, \ + (nettle_cipher_func *) (encrypt), \ + (length), (digest))) + +struct cmac_aes128_ctx CMAC128_CTX(struct aes128_ctx); + +void +cmac_aes128_set_key(struct cmac_aes128_ctx *ctx, const uint8_t *key); + +void +cmac_aes128_update(struct cmac_aes128_ctx *ctx, + size_t length, const uint8_t *data); + +void +cmac_aes128_digest(struct cmac_aes128_ctx *ctx, + size_t length, uint8_t *digest); + +struct cmac_aes256_ctx CMAC128_CTX(struct aes256_ctx); + +void +cmac_aes256_set_key(struct cmac_aes256_ctx *ctx, const uint8_t *key); + +void +cmac_aes256_update(struct cmac_aes256_ctx *ctx, + size_t length, const uint8_t *data); + +void +cmac_aes256_digest(struct cmac_aes256_ctx *ctx, + size_t length, uint8_t *digest); + +#ifdef __cplusplus +} +#endif + +#endif /* CMAC_H_INCLUDED */ diff --git a/examples/nettle-benchmark.c b/examples/nettle-benchmark.c index 4efcca5c..b8062c5b 100644 --- a/examples/nettle-benchmark.c +++ b/examples/nettle-benchmark.c @@ -64,6 +64,7 @@ #include "sha3.h" #include "twofish.h" #include "umac.h" +#include "cmac.h" #include "poly1305.h" #include "nettle-meta.h" @@ -403,7 +404,7 @@ time_umac(void) struct umac64_ctx ctx64; struct umac96_ctx ctx96; struct umac128_ctx ctx128; - + uint8_t key[16]; umac32_set_key (&ctx32, key); @@ -439,6 +440,24 @@ time_umac(void) time_function(bench_hash, &info)); } +static void +time_cmac(void) +{ + static uint8_t data[BENCH_BLOCK]; + struct bench_hash_info info; + struct cmac_aes128_ctx ctx; + + uint8_t key[16]; + + cmac_aes128_set_key (&ctx, key); + info.ctx = &ctx; + info.update = (nettle_hash_update_func *) cmac_aes128_update; + info.data = data; + + display("cmac-aes128", "update", AES_BLOCK_SIZE, + time_function(bench_hash, &info)); +} + static void time_poly1305_aes(void) { @@ -846,6 +865,9 @@ main(int argc, char **argv) if (!alg || strstr ("umac", alg)) time_umac(); + if (!alg || strstr ("cmac", alg)) + time_cmac(); + if (!alg || strstr ("poly1305-aes", alg)) time_poly1305_aes(); diff --git a/nettle.texinfo b/nettle.texinfo index f501cfbe..bfc97b5e 100644 --- a/nettle.texinfo +++ b/nettle.texinfo @@ -101,6 +101,7 @@ Keyed Hash Functions * HMAC:: * UMAC:: +* CMAC:: Public-key algorithms @@ -271,6 +272,9 @@ The implementation of the TWOFISH cipher is written by Ruud de Rooij. @item UMAC Written by @value{AUTHOR}. +@item CMAC +Written by Nikos Mavrogiannopoulos, @value{AUTHOR}, Jeremy Allison, Michael Adam and Stefan Metzmacher. + @item RSA Written by @value{AUTHOR}. Uses the GMP library for bignum operations. @@ -3134,6 +3138,7 @@ as well. @menu * HMAC:: * UMAC:: +* CMAC:: * Poly1305:: @end menu @@ -3476,7 +3481,60 @@ as described above, the new value is used unless you call the @code{_set_nonce} function explicitly for each message. @end deftypefun -@node Poly1305,, UMAC, Keyed hash functions +@node CMAC,, UMAC, Keyed hash functions +@subsection @acronym{CMAC} +@cindex CMAC + +@acronym{CMAC} is a message authentication code based on CBC encryption +mode. It is suitable for systems where block ciphers are preferrable +and perform better than hash functions. @acronym{CMAC} is specified in +@cite{RFC4493}. The block size is always 128 bits (16 octets). + +Nettle provides helper functions for @acronym{CMAC } with +the @acronym{AES} block cipher. + +Nettle defines @acronym{CMAC} in @file{<nettle/cmac.h>}. + +@deftp {Context struct} {struct cmac128_ctx} +@end deftp + +@defvr Constant CMAC128_DIGEST_SIZE +The size of an CMAC digest, 16. +@end defvr + +@deftypefun void cmac_aes128_set_key (struct cmac_aes128_ctx *@var{ctx}, const uint8_t *@var{key}) +This function initializes the @acronym{CMAC} context struct for AES-128. +@end deftypefun + +@deftypefun void cmac_aes128_update (struct cmac_aes128_ctx *@var{ctx}, size_t @var{length}, const uint8_t *@var{data}) +This function is called zero or more times to process the message. +@end deftypefun + +@deftypefun void cmac_aes128_digest (struct cmac_aes128_ctx *@var{ctx}, size_t @var{length}, uint8_t *@var{digest}) +Extracts the @acronym{MAC} of the message, writing it to @var{digest}. +@var{length} is usually equal to the specified output size, but if you +provide a smaller value, only the first @var{length} octets of the +@acronym{MAC} are written. This function resets the context for +processing of a new message with the same key. +@end deftypefun + +@deftypefun void cmac_aes256_set_key (struct cmac_aes256_ctx *@var{ctx}, const uint8_t *@var{key}) +This function initializes the @acronym{CMAC} context struct for AES-256. +@end deftypefun + +@deftypefun void cmac_aes256_update (struct cmac_aes256_ctx *@var{ctx}, size_t @var{length}, const uint8_t *@var{data}) +This function is called zero or more times to process the message. +@end deftypefun + +@deftypefun void cmac_aes256_digest (struct cmac_aes256_ctx *@var{ctx}, size_t @var{length}, uint8_t *@var{digest}) +Extracts the @acronym{MAC} of the message, writing it to @var{digest}. +@var{length} is usually equal to the specified output size, but if you +provide a smaller value, only the first @var{length} octets of the +@acronym{MAC} are written. This function resets the context for +processing of a new message with the same key. +@end deftypefun + +@node Poly1305,, CMAC, Keyed hash functions @comment node-name, next, previous, up @subsection Poly1305 diff --git a/testsuite/.test-rules.make b/testsuite/.test-rules.make index 1f780310..c7e04cb4 100644 --- a/testsuite/.test-rules.make +++ b/testsuite/.test-rules.make @@ -130,6 +130,9 @@ eax-test$(EXEEXT): eax-test.$(OBJEXT) ccm-test$(EXEEXT): ccm-test.$(OBJEXT) $(LINK) ccm-test.$(OBJEXT) $(TEST_OBJS) -o ccm-test$(EXEEXT) +cmac-test$(EXEEXT): cmac-test.$(OBJEXT) + $(LINK) cmac-test.$(OBJEXT) $(TEST_OBJS) -o cmac-test$(EXEEXT) + poly1305-test$(EXEEXT): poly1305-test.$(OBJEXT) $(LINK) poly1305-test.$(OBJEXT) $(TEST_OBJS) -o poly1305-test$(EXEEXT) diff --git a/testsuite/Makefile.in b/testsuite/Makefile.in index 3117d66d..dd1ecf41 100644 --- a/testsuite/Makefile.in +++ b/testsuite/Makefile.in @@ -26,6 +26,7 @@ TS_NETTLE_SOURCES = aes-test.c arcfour-test.c arctwo-test.c \ serpent-test.c twofish-test.c version-test.c \ knuth-lfib-test.c \ cbc-test.c cfb-test.c ctr-test.c gcm-test.c eax-test.c ccm-test.c \ + cmac-test.c \ poly1305-test.c chacha-poly1305-test.c \ hmac-test.c umac-test.c \ meta-hash-test.c meta-cipher-test.c\ diff --git a/testsuite/cmac-test.c b/testsuite/cmac-test.c new file mode 100644 index 00000000..58544f2a --- /dev/null +++ b/testsuite/cmac-test.c @@ -0,0 +1,146 @@ +#include "testutils.h" +#include "nettle-internal.h" +#include "cmac.h" + +typedef void set_key_func(void *ctx, const uint8_t *key); +typedef void update_func(void *ctx, size_t length, const uint8_t *data); +typedef void digest_func(void *ctx, size_t length, uint8_t *digest); + +#define test_cmac_aes128(key, msg, ref) \ + test_cmac_hash ((set_key_func*)cmac_aes128_set_key, (update_func*)cmac_aes128_update, \ + (digest_func*)cmac_aes128_digest, sizeof(struct cmac_aes128_ctx), \ + key, msg, ref) + +#define test_cmac_aes256(key, msg, ref) \ + test_cmac_hash ((set_key_func*)cmac_aes256_set_key, (update_func*)cmac_aes256_update, \ + (digest_func*)cmac_aes256_digest, sizeof(struct cmac_aes256_ctx), \ + key, msg, ref) + +static void +test_cmac_hash (set_key_func *set_key, update_func *update, + digest_func *digest, size_t ctx_size, + const struct tstring *key, const struct tstring *msg, + const struct tstring *ref) +{ + void *ctx; + uint8_t hash[16]; + unsigned i; + + ctx = xalloc(ctx_size); + + ASSERT (ref->length == sizeof(hash)); + ASSERT (key->length == 16 || key->length == 32); + set_key (ctx, key->data); + update (ctx, msg->length, msg->data); + digest (ctx, sizeof(hash), hash); + if (!MEMEQ (ref->length, ref->data, hash)) + { + fprintf (stderr, "cmac_hash failed, msg: "); + print_hex (msg->length, msg->data); + fprintf(stderr, "Output:"); + print_hex (16, hash); + fprintf(stderr, "Expected:"); + tstring_print_hex(ref); + fprintf(stderr, "\n"); + FAIL(); + } + + /* attempt to re-use the structure */ + update (ctx, msg->length, msg->data); + digest (ctx, sizeof(hash), hash); + if (!MEMEQ (ref->length, ref->data, hash)) + { + fprintf (stderr, "cmac_hash failed on re-use, msg: "); + print_hex (msg->length, msg->data); + fprintf(stderr, "Output:"); + print_hex (16, hash); + fprintf(stderr, "Expected:"); + tstring_print_hex(ref); + fprintf(stderr, "\n"); + FAIL(); + } + + /* attempt byte-by-byte hashing */ + set_key (ctx, key->data); + for (i=0;i<msg->length;i++) + update (ctx, 1, msg->data+i); + digest (ctx, sizeof(hash), hash); + if (!MEMEQ (ref->length, ref->data, hash)) + { + fprintf (stderr, "cmac_hash failed on byte-by-byte, msg: "); + print_hex (msg->length, msg->data); + fprintf(stderr, "Output:"); + print_hex (16, hash); + fprintf(stderr, "Expected:"); + tstring_print_hex(ref); + fprintf(stderr, "\n"); + FAIL(); + } +} + +void +test_main(void) +{ + /* + * CMAC-AES Test Vectors from RFC4493. + */ + test_cmac_aes128 (SHEX("2b7e151628aed2a6abf7158809cf4f3c"), + SDATA(""), + SHEX("bb1d6929e95937287fa37d129b756746")); + + test_cmac_aes128 (SHEX("2b7e151628aed2a6abf7158809cf4f3c"), + SHEX("6bc1bee22e409f96e93d7e117393172a"), + SHEX("070a16b46b4d4144f79bdd9dd04a287c")); + + test_cmac_aes128 (SHEX("2b7e151628aed2a6abf7158809cf4f3c"), + SHEX("6bc1bee22e409f96e93d7e117393172a" + "ae2d8a571e03ac9c9eb76fac45af8e51" + "30c81c46a35ce411"), + SHEX("dfa66747de9ae63030ca32611497c827")); + + test_cmac_aes128 (SHEX("2b7e151628aed2a6abf7158809cf4f3c"), + SHEX("6bc1bee22e409f96e93d7e117393172a" + "ae2d8a571e03ac9c9eb76fac45af8e51" + "30c81c46a35ce411e5fbc1191a0a52ef" + "f69f2445df4f9b17ad2b417be66c3710"), + SHEX("51f0bebf7e3b9d92fc49741779363cfe")); + + /* Additional tests with different keys (same plaintext) + * to check all variants of set_key() */ + test_cmac_aes128 (SHEX("2b7e151628aed2a8abf7158809cf4f3c"), + SHEX("6bc1bee22e409f96e93d7e117393172a" + "ae2d8a571e03ac9c9eb76fac45af8e51" + "30c81c46a35ce411"), + SHEX("87dd33c2945a4e228028690ae8954945")); + + test_cmac_aes128 (SHEX("2b7e1ab628aed2a8abf7158809cf4f3c"), + SHEX("6bc1bee22e409f96e93d7e117393172a" + "ae2d8a571e03ac9c9eb76fac45af8e51" + "30c81c46a35ce411"), + SHEX("f0dc613a88886c7ed76eeb51f1c5e8d3")); + + test_cmac_aes128 (SHEX("2b7e1ab628aed2a8abf7158809cf4f3d"), + SHEX("6bc1bee22e409f96e93d7e117393172a" + "ae2d8a571e03ac9c9eb76fac45af8e51" + "30c81c46a35ce411"), + SHEX("b9d092dc387a9e42cdfeb9f9930cf567")); + + /* CMAC-AES256 vectors taken from phplib */ + test_cmac_aes256 (SHEX("603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4"), + SDATA(""), + SHEX("028962f61b7bf89efc6b551f4667d983")); + + test_cmac_aes256 (SHEX("603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4"), + SHEX("6bc1bee22e409f96e93d7e117393172a"), + SHEX("28a7023f452e8f82bd4bf28d8c37c35c")); + + test_cmac_aes256 (SHEX("603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4"), + SHEX("6bc1bee22e409f96e93d7e117393172aae2d8a571e03ac9c9eb76fac45af8e5130c81c46a35ce411"), + SHEX("aaf3d8f1de5640c232f5b169b9c911e6")); + + test_cmac_aes256 (SHEX("603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4"), + SHEX("6bc1bee22e409f96e93d7e117393172aae2d8a571e03ac9c9eb76fac45af8e5130c81c46a35ce411e5fbc1191a0a52eff69f2445df4f9b17ad2b417be66c3710"), + SHEX("e1992190549f6ed5696a2c056c315410")); + +} + -- 2.14.3
_______________________________________________ nettle-bugs mailing list [email protected] http://lists.lysator.liu.se/mailman/listinfo/nettle-bugs
